Keys 4 Chapter
When using an additive mix for chroma keying, the (typically blue) background parts of the foreground video must be converted to black. For this, use the color cancel function (see page 267).
Using the plane function
In an additive mix, since no key is applied to the foreground, any variations in the (typically blue) background may appear in the composite image. To avoid this, a particular luminance level can be set for the (blue) background, and regions of lower luminance forcibly cut.
Use the following procedure.
1 In the Chroma Adjust menu, set [Plane] on.
2 Adjust the following parameter.
Knob | Parameter | Adjustment | Setting values |
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1 | Luminance | Luminance level | 0.00 to 100.00 |
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Chroma Key Adjustments
There are two ways of making chroma key adjustments: automatically, using the auto chroma key function, or manually, making individual adjustments such as color cancel adjustments and window adjustments.
Making auto chroma key adjustments
Auto chroma key is an automatic adjustment function which allows you to specify a part of the foreground video (for example, the blue background color) and use it as a reference for creating the chroma key image.
Use the following procedure.
1 In the
2 Select [Chroma Adjust].
The Chroma Adjust menu appears.
3 Select [Sample Mark] in the <Auto> group.
The foreground video only appears on the monitor, with a white box- shaped sample selector.
266 Key Setting Operations Using Menus